Ostap Dashkevych
Ostaphii "Ostap" Dashkevych (Ukrainian: Остафій Дашкевич; born in Ovruch 1470 – died after 1535) is one of the earliest recorded leaders of an organized Cossack defense force.
Dashkevych held a position of starosta in Cherkasy and Kaniv (1514–35). At the early stages of development of Cossacks he was inormally referred to as a ataman. Some sources as well as oral tradition claim that Dashkevych lived past the age of 80, at which age he routed the Tatars at Cherkasy.